general john allen. the man entrusted with winding down the nation war in afghanistan. martha explains what happened today. >>reporter: breath taking. within days 2 4 star generals so widely respected in the midst of scandal. first david petraeus and now general john allen being investigated for sending what the pentagon said were potentially inappropriate messages. putting on hold his likely promotion to become the supreme allied commander in europe. >> of course it weighs on him. as much as it ways on dave petraeus. i believe that davis very, very sad for what he has admitted he did. >> at the center of the web jill kelly. tampa socialite and honorary military ambassador living near where the head quarters where petraeus and allen were based. it was early this summer that kelly received anonymous e-mails accusing her of flaun flaunting her friendly relationship with top military brass. fbi traced those e-mails back to paula broadwell computer where they discovered the evidence of broadwell affair with david petraeus. but it doesn't stop there abc news has learned that